Superior sensing sensitivity of ZnFe2O4 nano-octahedrons and sensing reaction molecule mechanism of polar ZnFe2O4 {111} surfaces

Xiaohua Meng,Yuhong Li,Xiaoling Yang, Francis Francisco Prudence

JOURNAL OF ALLOYS AND COMPOUNDS(2023)

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Abstract
A solvothermal process prepared ZnFe2O4 nano-octahedrons with {111} crystal planes exposed. In the gas sensing performance experiment, the product showed good sensing activity towards ethanol, acetone or triethylamine. The sensitivity of the nano-octahedrons is further enhanced by adding 3-coordinated Zn atoms (Zn-3c) on the exposed (111) crystal plane after the surface chloride ions and hydroxyl groups are removed by hydrogenation. The atomic-scale gas-sensitive mechanism is proposed using Zn-3c atoms as sensitive response active sites. It is believed that the Zn-3c plays three roles: adsorbing the O-2 molecule, generating free electrons, and catalyzing the reaction between O-2 and the gas being measured. The sensing mechanism, in which unsaturated metal atoms are reactive sites, explains the sensor's increased sensitivity, which is the basis for developing a high-performance gas detector. (c) 2022 Elsevier B.V. All rights reserved.
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Key words
ZnFe2O4 nano-octahedrons,Polar ZnFe2O4 {111} Surfaces,3-coordinated unsaturated Zn atoms,Gas sensing mechanism
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